I thought her role in Time of the Wolf was nothing interesting. She plays a "normal" woman with no special features, excentricity`s, etc. more introverted than anything else. The acting fits the role, but she isn`t the main character. As Arsaib said, it`s more of an ensemle piece.
What I found very lacking was the screenplay and the dialogues. The film was very schematic in its presentation of people dealing with different situations, and to me it seemed as if Haneke had a check list which he worked through - not very inspiring. But as this is still Haneke making something he cares about (though I wonder if he hasn`t become a bit lazy, catering more to (festival)-audiences after he has become such a renowned director), there are some great moments in the film, along with a fine ending. The best character for me in the film was nature itself, though the focus was (sadly) primarily on people. And I think Haneke`s aim in not telling the cause of the catastrophe, so the audience doesn`t debate about its probability, backfires heavily, as I was wondering what exactly happened throughout the film.
Compared to "Code: Unknown" and "The Piano Teacher" a satisfying but mediocre effort. Solid "art-house" cinema.